It has been shown that unlike its constituent nanocrystalline (NC) phase, a heterogeneous lamella (HL) composite comprising NC and coarse-grain layers exhibits greatly improved ductility. To understand the origin of this enhancement, we present a 3D discrete dislocation, crystal plasticity finite element model to study the development of strains across this microstructure. Here we show that the HL structure homogenizes the plastic strains in the NC layer, weakening the effect of strain concentrations. These findings can provide valuable insight into the effects of material length scales on material instabilities, which is needed to design heterogeneous structures with superior properties.
R. Yuan et al., "Homogenization of Plastic Deformation in Heterogeneous Lamella Structures," Materials Research Letters, Taylor & Francis Ltd., Nov 2016.
The definitive version is available at http://dx.doi.org/10.1080/21663831.2016.1255264
Materials Science and Engineering
Center for High Performance Computing Research
Keywords and Phrases
Dislocations; Heterogeneous; Instability; Statistics; Strain Gradients
International Standard Serial Number (ISSN)
Article - Journal
© 2016 Yuan, Rui and Beyerlein, Irene J. and Zhou, Caizhi, All rights reserved.